In both Rumaila and Zubair fields, operators were challenged by declining injector and producer performance in sandstone intervals characterized by high clay content, HCl-sensitive minerals, and carbonates. Conventional multistage acid treatments required complex fluid sequences and extended pumping time, increasing exposure to precipitation, fines migration, and corrosion risks. Sustained injectivity improvements were difficult to achieve, particularly in the upper shale intervals in Rumaila, where near-wellbore damage and brine-related impairment limited performance.
Previous stimulation attempts using legacy multistage acid systems yielded inconsistent results, with limited durability of injectivity gains and operational inefficiencies due to large fluid volumes and equipment footprint. Customers were seeking a lower-risk, simplified approach capable of restoring permeability while minimizing secondary formation damage and logistical exposure—especially in rigless execution windows in Zubair.
The primary objective was to restore injectivity and production performance in complex sandstone reservoirs while reducing operational risk, simplifying execution, and enabling repeatable deployment across candidate wells.
